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c906108c SS |
1 | /* This file is part of the program psim. |
2 | ||
3 | Copyright (C) 1994-1995, Andrew Cagney <cagney@highland.com.au> | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
3fd725ef | 7 | the Free Software Foundation; either version 3 of the License, or |
c906108c SS |
8 | (at your option) any later version. |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
51b318de | 16 | along with this program; if not, see <http://www.gnu.org/licenses/>. |
c906108c SS |
17 | |
18 | */ | |
19 | ||
20 | ||
21 | /* branch macro's: | |
22 | ||
23 | The macro's below implement the semantics of the PowerPC jump | |
24 | instructions. */ | |
25 | ||
26 | ||
27 | /* If so required, update the Link Register with the next sequential | |
28 | instruction address */ | |
29 | ||
30 | #define UPDATE_LK \ | |
31 | do { \ | |
32 | if (update_LK) { \ | |
33 | ppc_ia target = cia + 4; \ | |
34 | ppc_spr new_address = (ppc_spr)IEA_MASKED(ppc_is_64bit(processor), \ | |
35 | target); \ | |
36 | LR = new_address; \ | |
37 | } \ | |
38 | ITRACE(trace_branch, \ | |
39 | ("UPDATE_LK - update_LK=%d lr=0x%x cia=0x%x\n", \ | |
40 | update_LK, LR, cia); \ | |
41 | } while (0) | |
42 | ||
43 | ||
44 | /* take the branch - absolute or relative - possibly updating the link | |
45 | register */ | |
46 | ||
47 | #define BRANCH(ADDRESS) \ | |
48 | do { \ | |
49 | UPDATE_LK; \ | |
50 | if (update_AA) { \ | |
51 | ppc_ia target = (ppc_ia)(ADDRESS); \ | |
52 | nia = (ppc_ia)IEA_MASKED(ppc_is_64bit(processor), target); \ | |
53 | } \ | |
54 | else { \ | |
55 | ppc_ia target = cia + ADDRESS; \ | |
56 | nia = (ppc_ia)IEA_MASKED(ppc_is_64bit(processor), target); \ | |
57 | } \ | |
58 | PTRACE(trace_branch, \ | |
59 | ("BRANCH - update_AA=%d update_LK=%d nia=0x%x cia=0x%x\n", \ | |
60 | update_AA, update_LK, nia, cia); \ | |
61 | } while (0) |